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Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 1
Written by Boryana STEFANOVA, Georgi POPSKI

Due to the need to expand its plum assortment in the mountainous regions of the country, the German plum cultivars from the selection program of Prof. Jacob's collection at the Geisenheim Research Station in Germany, 'Topgigant plus’, 'Topking’, 'Topper’, 'Top 2000’, 'Top’, 'Topend plus’, 'p33-6-94’, were introduced in the RIMSA Troyan in 2008. For the period 2016-2019, the climatic factors of the Troyan region were analyzed, the phenology of the cultivars (flowering and ripening time), vegetative and reproductive characteristics were supplemented, which were complemented by laboratory analyzes of the fruits. The 'Top 2000’ cv. was first blossomed (at the end of March, the first days of April, depending on climatic conditions. The lowest growth was in the 'Topper’ cv., which was adapted to intensify the planting scheme. The largest are the fruits of 'Topgiant plus’ (77.34 g) and have the smallest share of stone (2.75%) for 2019, ripening relatively earlier than the others. The highest content of total sugars (9.4%) and high glucoacidimetric ratio (12.37) are of the 'Topper’ cv.. 'Topper’ (0.18 kg / cm2) and 'p33-6-94’ (0.15 kg / cm2) are distinguished by high productivity values. The German plum varieties of the Top group are suitable for cultivation in the mountainous conditions of the Troyan region, using technologies that meet the specificities of each cultivar.

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